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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0508ada13524fa9c88db2e130dbb8df48dfc8fa46a273427d9e125dcb65dc30f' 
  AND token = 'X6HU7PelUg9deDB837FYiFk1KCluTbEl9rLNYtQlWgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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