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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99743c92bd8c051efce395569c8ff0d9793948e46950a8788db4f76714f0154e' 
  AND token = 'z5+sFQrrhfYMyxreICUDnJ3M7W1oLiiJ9XCerOGKmTs=' 
  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"
    }
  }
}