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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615d2c39aae922ce79401fa2131fd5d84ba995e9d16ead4fb80710cfbec82cc2' 
  AND token = '0tBtQSJ0dArT/2SCXsfs4ZPnRW65f1O5HS34DeezKQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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