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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64d5422603df10cd68ce16437afca5c7e84a174da6305f145d19879bbd40ec73' 
  AND token = 'XPRAPmHyqeEpaak0RQM2NibguksedZs28vBqlY9MWOU=' 
  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"
    }
  }
}