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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe395273f7236a076f07fc8c3198f357e6763b33a384e5aac7babd1c3ae6e18' 
  AND token = 'W/h2poy64G+ATiQ1MEpuAGNmdoO5JVZRuHtA0VeNSPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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