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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa1abcecd21ff5e2a7fc9f4e78213bfc9968fb5e723930c0c19ca3bef6b7704' 
  AND token = '4uSzgtQJWorRnflKq5FS6+nefC2O3GypQw7ZUPSJ21A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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