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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8a50dc76ab4c425a8a68e7836162fed316fce5ebd1bb0411fb5f740d50c50e' 
  AND token = 'rNjGxK49rndltACvEk8gTueya6CmbZVfiyhBrFotkR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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