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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6067899aa81758b1d8ae2c0ad28f4bc894240c80f76c5cb0a5fae3fe83ee69f6' 
  AND token = 'nv+ro6UH6DHy1igTTvF46JnRPWg6RR/z4A5/sWS17Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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