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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf2bd2fd8d32c5136105a878dfa5d210f42bf32cc854da79c71e77d028d8d6b' 
  AND token = 'EpxSrqGhwfHbrri8uuAJDkN2h8+o/6i9nCTy3r2WDMQ=' 
  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"
    }
  }
}