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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa21ad4391b73f97d8c8c05a4ae5cc724f672d4fbd7e73000a3e8a29d658d1e7' 
  AND token = 'iuCVeRNJ9JPH8CxAJ/kZLnR0kfu94FWuHC8Ng/ApeKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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