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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26bf87d7c28cb461c914aeb53ea8c635dacc830a83dcc394032d24c36123844' 
  AND token = 'FGlwI8nXRw/W5lmx2HCdG3jD3cEi0J9R5OnCgEi7Bc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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