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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f38ca09b507930b095dcb8d2c0c23038c0edac34bb0631e2ddbbcf02b5d4451' 
  AND token = 'GlkmhQ2gS85O/Gdpxqk8yW7V4oKi61P8X+tM98uZlqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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