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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb5d37b8498b5eb70fc793718329999f9f9b70c70f1d5870563c4ec4f16b645' 
  AND token = 'M86UetIpZFT6DEphz+b8ZVFm9I3A/u27KJ3UIgKm5SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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