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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee4abd9926449ee0092d33ed696017199cb8bd74bdaea85f1da65699c3377c6' 
  AND token = '4n7eY3bizafvaRHwKLVb3Y8ToW/Pcl4JERSZSCx604Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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