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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60fe447ce378141f45c5f3bc37a7d61131f296f8db13ef3726b9b6864d9447f6' 
  AND token = 'Pg1x71dA3p/R4xwL8ZfVP3m5RZMwIUD62gp13kmZUF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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