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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562e5933f075f126b137b424607edffef7c80ec90d3306e109a2e607d364b92d' 
  AND token = 'o1H8FWR1U8McLkbvGVU3v3IbZsBlpZDuMxf0Kb/QG4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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