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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedd29a9558f25c60eb40c4733f288b8cde18b148c5961ad9d873f216b3c1c4f' 
  AND token = 'v6/WTn27T3nlS7HcvKgPw9Dmz51970fm2HytWxeROBw=' 
  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"
    }
  }
}