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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f95f39f3c6357f663090d4b1e96c537a31bda8e38be8ea694ca71308da08269' 
  AND token = 'cxmw6f2cikBw3VdZOpLqEGsAp6IOsyofJB3e5CulkSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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