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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b39cbe821bd007c9958f37f736de0e57c993d9ccb4604cbff74b187e2031457' 
  AND token = '8m6t4aun21c0u2m2E7U8ondDXD1QMZWuY/+theJEEIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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