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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917ec6b93b415bfa1c48bf13909f3905f5fa335532035eaa9f180700c4746f1e' 
  AND token = 'SFzE6c4eBul5oCzAI4buk6RZvGCvgGhC3isXbswv3/A=' 
  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"
    }
  }
}