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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c17c7cc81f3264816f0e5713c7195077d79c115f323495f99ab0f18378a24ed6' 
  AND token = 'jU3r2761vg7PcuWqNHET5DN0HJ0vSQHAahnTjOTD068=' 
  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"
    }
  }
}