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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb08452e7f7b4e4f500caac7e0b6bd05f7857abbbb65bdb965ba4fe49dd2620' 
  AND token = 'ETFStUcZ/BpDaZLPRTe6T5+5FsYTJHjp4B/kvh1GXpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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