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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869c2efb10ba5bce6499f50e0fcc3d0495e43567d84af0347ffc09f3d1d25568' 
  AND token = '9IDgL2DbPKvg3V57c0EEY+vCRcC8FJ7Rfn4dtdEsVGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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