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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd6709f9f2cc490e06b99ca77078b6e7c87d8cce060aea319d0ca9a4e39cf16' 
  AND token = 'jcMzF4gvJQYS3ghxqbB/E8P4V2XWj/EghO0eVbK5nfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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