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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72db2d18f1099b0ff9327ece016c2a5f8981751d9afbd3300ca442261f43a9ef' 
  AND token = 'p5lPnVyzLYOhxe65j3S9WRFMHhVQys6t49QOaRN8rDw=' 
  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"
    }
  }
}