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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c666a3db7aa625664edb517a60cf36cb47be13823f4724cc7654cda7ceb0f22' 
  AND token = 'J1tboVzHL/yI5lAXEwnaLGWTzYfj8fa5ndvxu6uoNRc=' 
  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"
    }
  }
}