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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b1b7ea20dd47a604072c534398e2e0247f8721b4bae89a2ccfce0d5a79adf24' 
  AND token = 'um/V+X0m8G+6lmH+jd0lb9cfa4HplbgJzG1VFIN8OAY=' 
  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"
    }
  }
}