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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce6836a53c2efceb3585c6aca96c42f7dd99e78cf312d59a9a1e8930b4a12df' 
  AND token = 'Ksdvw2G5xmBXwtJD4HdKfKNKAJ6Jq47FD3J16Am1zc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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