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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf63ea65b60523ee1bcbb0bd77ea5a2cf4cd58fbda91d2b9df03759cdf076df7' 
  AND token = 'PnF1m/aeti8Bi63WM80/n+s3Px1AHNivl6zSBOHnKe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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