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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f85ee4895fedcde506a19c0d5a7a5a0dbb8956f3678e062992b44a24839cd6' 
  AND token = 'oL4Jcz6or2D02krxCJI+pWUb+/MQNJnEXfTmad+csS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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