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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c8ca2ef1e78f861476b87f92d192d465bc2fbbc17fc23764121751dd2ad86b' 
  AND token = '1XvfgTbwkmAdZEH5ci0xxZ7qlt168O7YdpaeR4yiWJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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