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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a9e92188cf9b19481e20863161c5e486a75073a15299fc547c542504d598d5' 
  AND token = 'WOJm3Wp7cPzD14OFDMtPW8Tz3Wzcq7mfswaSsvMJZkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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