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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea9db21a58f18480f5d71a21772ea3af99cee61ec3210acc554bbff7480493e' 
  AND token = 'vKyZ4Ev0gJNg4B4ETTw62cFYy+Vb0iDB/UF9dTnq2MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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