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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb8ab6d64faabccdbde3d59e7930d4dba2a66db083440f40b54c032b28ae6bc' 
  AND token = 'm/TQcO2iyY9muUnN2m9VA5c2qOJpTHt6XR8RvhunJOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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