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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201db2704c1472de49eac88beb973883f9ad2f98c873e4a7d693b44cda90791b' 
  AND token = 'g0HfzRUWUN/zqUc7oCQlgSBZsBQbcykAWk8hAri3UX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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