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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694a554bd393c67f80c05b71a271c1b0a6b57c6c60520be4fe6ac03a8dfb315a' 
  AND token = 'cvoAetHIFmBWL0EWAb7d58oU0alA3W1V+wqSsSMsk14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}