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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f80862bf3105f9093b5c45af8db2c9a5f47025ea3783bb724c6e583cdc9c4501' 
  AND token = '9daxc8rE1noJAlu1c2brs/CxhodaU30Ka0yZN42GM+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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