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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4dbf5051baf349fed31c9caea162f6607e23d122f0123bd703774ff3a6cc9b8' 
  AND token = 'GgkIAqk4XKL+4Vl/oC3XzXRrasPtUnoMV4q2mMIHk84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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