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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf4334514fedb93f5ae86c23095d81cc6e5c04ba0217e70254b1d66ccb19da7' 
  AND token = 'Ocnqaev/2kSzov8dX0fvm+R6/ov5iaWGZ3bz8DUI6cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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