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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '245764ba5fd505fd2b9946c70919052cf2c70272b7d96b389535e9b46bd1e4ef' 
  AND token = 'aa4s1EQe3k4RrOdplFKRo9hQ1Qc29k8a/3NX4kjOVng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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