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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d4ce6302866673f74cdac827cc1ff9aad769191fa7ab590be4414b728fc423' 
  AND token = '4KpE1V9tFQR8M8FY1tCwF0uxMd3wLSSy1Ow6zvigyQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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