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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c44ec180d0d20a27621da163bc18a85436c204f1bf964ac016eb64377fcc3038' 
  AND token = 'ANX/2v9RjmwFR25taz08w9t6RwV0D2+pRIZpozZaYF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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