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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba9fb2e52d4d9b461b30b2703c5e5c0e1b44ac8bf4ea1fcf9acf0753b2bf982' 
  AND token = '6gcwxHrw7DgTDK8lLtqsaKyxeDwlxFXB5g8m1o5wlrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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