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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac68e78d4bbd63c0e158967994e22ddef3123ca2c93fd3eb76c3f411a68f3611' 
  AND token = '1w3ya06ZCo26vB+LXaeyi51+RX7/VFVUAMPTNUWY+zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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