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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a7ff4ba27a7298644c1a77e4b7f66b4eba91fa203db75c5b592b325c1152f6f' 
  AND token = 'SLEDvVTBCdHA36O6ZCtEBi2fYdlC78qTc7Oz7Jlwyi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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