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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a072ea76a584ea1010f6d88cf4fb252b83b02dad1f14a3a632c2b50d6b90695b' 
  AND token = 'PiQ6Ve1iE2m4WXRyUU7aYeAA0RZu+dcIe4WC4tx1voc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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