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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e60b6efb3e55141bb60f435f4b250d7a2c526e35d741bd137d12a5cd40b6f7c' 
  AND token = 'UNa7mr2P+95eoKT3NuCt/TkZksmrhkk/+HrjXis4s8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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