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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdce71e481340f0146b6b85b580ef74b95526667e73a112f2090fffc6f071939' 
  AND token = 'sICal85xjYAN6GjpMozv0AurJUQx6bkcb7gcfpthP1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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