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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ccb45237e8f7c41af29f80200d2e537a956a3c7aac53a6e063afcbc5e666a5' 
  AND token = 'ykBguuKzD16tCdenc3JeChv4rOP1BH3T1PBU2C6p1KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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