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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd600a1ba18ea5541785b88be320f707a9efabc901b05c6fca1ab98ab56c7785' 
  AND token = 'ZRcp0OmLXL9kfD/MVMfFATTmALW8g/mQGulX5sZRigA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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