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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a2d367d40c21885cd28e19e8ed48504d1799fcb7e0a54e959806dfe9bc992e' 
  AND token = '71gvti3rqAxckAXAlGN6NPabTKDdws2BIiT1EdPlA2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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