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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf52332bdda8963a8b4a2aa6ef7c77ed71683c2a5ec04ea89f9cc990cd4aa006' 
  AND token = 'lYBzTBCL7s36iSrTqz+1Tz1AbJSXZQJqQKEYExfnabc=' 
  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"
    }
  }
}