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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b20b48c78aaacb32e04e9f046466d6d1f0e355a3eb1baa721c293e1fb2e3459' 
  AND token = 'A14M0oFrIQ9qQdZZsrkOPl7X0nPx2caSwAFhqa+TeoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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