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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e888fac91ada3d8d7bae2e56a401d08d9f3d1569882e7b1ff0a4a9a7b6b25cd9' 
  AND token = 'cZ+BT4oQYm0fUuzYgqJ1z1Nd0hk2pn9cFAurbfgjn0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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