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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52f4a92b5c006af1bac2fe455982feb7a180c59a25c9925873112f073619be5' 
  AND token = '0lv8B2/Xba5geywbyhlyw6SuzS+l9drR72FnrVGQmYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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