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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198acb68c7da3fd08b33afb6326eed6eea7bb548ca6af452864b7f37a35a2b4d' 
  AND token = '3VNIfVGBbHKS9draeyVreD3FrcW4v5hl17unTTTXfwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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