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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f49353c4a3ee0e21ac9dc940b63d69a231005eca4da057e0eb3dd25c5a1c27dd' 
  AND token = 'Ix38+i+/+7x0oRIAq09mfSBaDc8Y9lew2knLypZ+93I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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