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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792fe87a5c4320225d5ceeb22387d4695c306c2ffd49dea658c8c8662ffadbcd' 
  AND token = 'PKx3jodkbDG1BURRUcXKW5rV2xIUv5FYBmmMNXqhM28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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