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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '480fbdbd8cc2a05b2dfb3836ae1b42fe4a67c008482b9d4c3fddecf9e63704b2' 
  AND token = '4Qx/xYBT5MIygc4rAO4vW/iYK+BxyAwpfAw/v3eEB5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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