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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865554f6aae8ba1941da241426634ce41e20d46693eaa116db02b754b6907337' 
  AND token = 'VeluD2DU54hNZfTOklHVA6R188n0wd/o8XmO6UpmXG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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