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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36caf430cd8fc8f2536d46236a3b306bd51717929b5b8472045a970a1117109' 
  AND token = '1hc7lOemCjNXhvrxhaX1kmG+y+1JgdOcpqVHH8hP7M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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