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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99a95f9a01585a1cb1a2c61245d5593b11eb54bc17a8cd8f7ec16f53260752f' 
  AND token = '89z24PSUNbnDJ9RCUgwYc27TzBW1GHepK79J/3MJ430=' 
  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"
    }
  }
}