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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34009ee1efb6531b8820c0a6f1678d91a662bea4e519b0c641ff10d204a82c7' 
  AND token = '45yeTkt60RqBJqnexyGynNZaoPhoFcw8ku1HVy3fEY0=' 
  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"
    }
  }
}