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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41aa3eaa33a48100997ffc1177eb05a7f3d668774be61f4c7506fbae7ca9ca80' 
  AND token = 'b6f8g6SwbfsAORuEmUO74PKfw0mZYBPbYg7iJndvVRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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