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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392b5e85c31f905fd2a19a2df9f512f09b7c8ad501c5a81aecbe0b951defc710' 
  AND token = '2HlLDh4hhitSn5SWxLCCFnl2RdeHo2Pko7khmYCwq/8=' 
  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"
    }
  }
}